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Note 6 - Derivative Obligations (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 29, 2016
Feb. 16, 2016
Jun. 30, 2016
Jun. 30, 2015
Aug. 31, 2015
Series A Warrant [Member]          
Class of Warrant or Right, Outstanding     404,412   404,412
Fair Value Assumptions, Expected Volatility Rate 91.00%        
Fair Value Inputs, Discount Rate 1.20%        
Fair Value Assumptions, Expected Term 5 years        
Fair Value Assumptions, Expected Dividend Rate 0.00%        
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 8       $ 13.60
Series B Warrant [Member]          
Class of Warrant or Right, Outstanding     222,427   222,427
Warrants Exercised   26,528 25,185    
Shares Issued for Cashless Exercise of Warrants   125,000 106,711    
Warrants Not Settleable in Cash, Fair Value Disclosure   $ 25 $ 33    
Fair Value Assumptions, Expected Volatility Rate     88.00%    
Fair Value Inputs, Discount Rate     0.57%    
Fair Value Assumptions, Expected Term     1 year 73 days    
Fair Value Assumptions, Expected Dividend Rate     0.00%    
Gain (Loss) on Cashless Exercise of Warrants     $ (1,039)    
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 13.60
Derivative Liability     4,282    
Derivative, Gain (Loss) on Derivative, Net     $ 3,395  
Fair Value Assumptions, Expected Volatility Rate     80.00% 75.00%  
Fair Value Assumptions, Expected Term     5 years 5 years  
Fair Value Assumptions, Expected Dividend Rate     0.00% 0.00%  
Gain (Loss) on Cashless Exercise of Warrants     $ (1,039)  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 8